166613825 has 36 divisors (see below), whose sum is σ = 241805952. Its totient is φ = 111559200.

The previous prime is 166613819. The next prime is 166613827. The reversal of 166613825 is 528316661.

166613825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166613825 - 2⁶ = 166613761 is a prime.

It is a super-2 number, since 2×166613825² = 55520333362261250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166613827) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 386360 + ... + 386790.

It is an arithmetic number, because the mean of its divisors is an integer number (6716832).

Almost surely, 2^166613825 is an apocalyptic number.

It is an amenable number.

166613825 is a deficient number, since it is larger than the sum of its proper divisors (75192127).

166613825 is an equidigital number, since it uses as much as digits as its factorization.

166613825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 490 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 166613825 is about 12907.8977761679. The cubic root of 166613825 is about 550.2630422218.

It can be divided in two parts, 166 and 613825, that multiplied together give a triangular number (101894950 = T₁₄₂₇₅).

The spelling of 166613825 in words is "one hundred sixty-six million, six hundred thirteen thousand, eight hundred twenty-five".